pump tower function tests Shuoxing Wu WA105-3x1x1 bi-weekly meeting - PowerPoint PPT Presentation

pump tower function tests Shuoxing Wu WA105-3x1x1 bi-weekly meeting 27.07.2016

LAr pump tower Shuoxing Wu ETHZ 2

LAr pump tower function test self-recirculation to simulate outer LAr bath real operation condition ∆ h valves open pump Shuoxing Wu ETHZ 3

level difference measurement ∆ h vs motor speed pump running video https://www.dropbox.com/s/2ea4ewib5yuc389/VID_20160721_102310.mp4?dl=0 40 Measurements using pressure gauge 35 Measurements using tape measure 30 25 H (cm) 20 ∆ 15 10 5 0 1500 2000 2500 3000 3500 Pump motor speed (RPM) Maximal level difference of 36 cm will cause an increase the LAr level in the 3x1x1 main vessel by 1.5 mm Shuoxing Wu ETHZ 4

Conclusions 1. Pump mechanical extraction/insertion OK. 2. Pump is quite and no vibration. 2. Maximal level difference is 36 cm at rated speed. 3. Pump tower will be delivered next week. Points to pay attention 1. After pumping, the pump should be completely dry — moisture inside the pump will become ice thus to block the impeller. 2. Need to discuss with Michael/David to change the filling procedure — first fill the pump tower and test the pump before filling the whole cryostat. Shuoxing Wu ETHZ 5